Sander attachment



Oct. 2.6,V 1943. l. R. swANK SANDER ATTACHMENT v Filed April 23, 1942 2Sheets-Sheet 1 @www 0000 OOOO Oct. 26, 1943. L. R. swANK SANDERATTACHMENT Filed April 23, 1942 2 Sheets-Sheet 2 Patented Oct. 26, 1943UNITED, STATES PATENT OFFICE SANDER ATTACHMENT Lewis R. Swank, Lewiston,Idaho Application April 23, 1942, Serial No. 440,223

Claims.

This invention relates to an attachment for a portable sanding machineand while capable of use generally it is primarily adapted for featheredging paint wherever spot jobs are made and for conditioningmetal'which has been sanded with a coarse, disc sander or theequivalent.

It is aimed to provide a novel means preferably readily attachable toand detachable from the sander which includes an arm carrying theabrading element and to which arm an eccentric motion is imparted fromthe power-take-off shaft of the sander.

It is also an object to provide such a construction wherein said arm hasa ball connec-` tion with a novel handle provided with means forgripping the handle of the sander.

The more specific objects and advantages will in part be pointed out andwill otherwise become apparent as the description of one operative formis hereinafter described with relation to accompanying drawings.

In said drawings:

Figure 1 is a side elevation showing my im provement applied to asander;

Figure 2 is a bottom or inverted plan view of the parts of Figure 1;

Figure 3 is a vertical section taken on the line 3 3 of Figure 1;

Figure 4 is a horizontal section taken on the line o1 4 4 of Figure 1;

Figure 5 is a vertical section taken on the line 5 5 of Fig. 2;

Figure 6 is a vertical section taken on the line 6 6 of Figure 4; and,

. disc means I4 is removably fastened and which is adapted for mountingan abrading element thereagainst. Such shaft I3 at its lower end has ascrew threaded socket I5 usually entered by screw means to secure thedisc means I 4 in place.

My improvements with the sander described are of such a nature that theybe readily attached thereto or detached therefrom so that the sander isnot impaired for normal use as well as use in accordance with myinvention.

In carrying out or practicing the invention, an arm or body I6 of wood,steel, aluminum or any other desired metal or material is provided.Adjacent one end, arm I6 carries an abrading element Il which may be ablockof sponge rubber throughout which the abrading material isdispersed, or it may be of any other material or character. This elementis gripped or detachably held in place between jaws I8 and I9. Jaws I8and I9 are pivotally connected together and to the arm I6 by means of anendless frame 29. Pivoted on the frame 20 yis a lever 22 which isadapted for cam or binding engagement with a notch 23 in the jaw I9 tofasten the jaws in gripping engagement with the abrading element.

Adjacent the other end, the arm I6 is anchored in a ball 24 which inturn has 'bearing in a bracket or socket 25 which is adjustablyconnected by means of a bolt 26 or equivalent, to an open or endlesshandle 21. Said handle 21 depends from a clasp or grip 28, for instance,of U=shape, as shown, and it is fastened to the latter by rivets or anyequivalent means at 29. Clasp 28 is resilient and readily clips `on andoif the handle I2 as shown.

An eccentric drive connection for the arm I6 is provided between thesame and the shaft I3 at a point between the bearing ball 24 and theabrading element I1. This eccentric connection consists of an eccentricor cam generally designated 39 and consisting of a counterweight disc 3Iand a disc bearing 32 integral therewith but offset therefrom. Ananchoring stud 33 projects from the disc 3I and is screw threaded intothe socket I5 so that the eccentric element will be rotated through therotation of the power takeoff shaft I3. The offset disc 32 is journaledin a bushing or cup 34 fastened to the arm I6. This bushing 34, may havea pair of pins 35 which removably engage recesses 36 in the arm. A studscrew 31 has an enlarged or bearing portion 38 journaled in an openingin the arm I6 at 39 and a screw threaded shank 40 extends looselythrough the bottom wall of the cup and is screw threaded in a recess 4Iof the disc 32.

- Thrust discs 42 may be interposed between the anti-friction ballbearing or other means may be used in connection therewith.

In the use of the device, the sander may be held as usual or it may begripped by the handle 21 and that the operation of its motor rotates thepower take-oft shaft I3 which in turn imparts an eccentric movement tothe arm I 8 so that an abrading motion is given to the abrading elementI1, the arm moving on the ball at 24.

Various changes may be resorted to provided they fall within the spiritand scope of the invention as deiined by the appended claims.

I claim as my invention:

1. In combination with a sander and its power take-oil shaft, anabradant-carrying arm, a grip attachable to the sander, a means pivotingthe arm to the grip, a frame extending from the' grip, a bracketattached to the frame, said arm extending through a ball, said ballbeing journaied on said bracket, and an eccentric drive from the powertake-off shaft to said arm.

2. In combination with a sander and its power take-on* shaft, anabradant-carrying arm, a grip attachable tc the sander, a means pivotingthe arm to the grip, a frame extending from the grip, a bracket attachedto the frame, said arm extending through a ball, said ball beingjournaled on said bracket, an eccentric drive from the power take-oshaft to said arm comprising an eccentric element having a studattachable in a socket on said shaft, an offset disc on said element, abushing on said arm, and a fasteningr journaled in the arm and bushingconnected to the offset element.

3. In combination with a sander and its power take-oft shaft, anabradant-carrying arm, means pivoting the arm to the sander, said shafthaving a screw threaded opening, an eccentric element having a studsecured in said` opening, a counter-weight disc pn said element, anoffset disc on said element, a bushing on said arm in which the'secondmentioned disc is jcurnaled, and a fastening passing loosely through thearm and connected to the second mentioned disc.

4. In combination with a sander and its power take-oil shaft, anabradant-carrying arm, means pivoting the arm to the sander, said shafthav ing a screw threaded opening, an eccentric element having a studsecured in said opening, a counter-weight disc on. said element, anoiset disc on said element, a bushing on said arm in which the secondmentioned disc is journaled, and a fastening passing loosely through thearm and connected to the second mentioned disc, means to hold thebushing against turning relatively to the arm.

5. In combination with a sander having a power take-01T shaft, anabradant-carrying arm, means pivoting the arm to the sander, aneccentric element, means to attach said element to said shaft, saidelement having a counterweight disc, an offset bearing disc attached tothe rst disc, a bushing carried by the arm against movement relativelythereto, the second mentioned disc being journaled in the bushing, and asecuring element passing loosely through the arm into the secondmentioned disc.

LEWIS R. SWANK.

